Am I limited to a certain number of
miles per year when I lease a car?

Yes. Most auto leases limit the number of miles you can
drive per year (often 12,000 to 15,000). You can generally
negotiate a higher number, but you will be paying a higher
monthly fee. If you exceed the number of allowed miles at
the end of you lease, you will have to pay a penalty. Be
sure to understand how the penalty is calculated. Ask
questions!